package InterfaceDemo;

public class Projector implements Device {
    private String brand;
    public Projector (String brand){
        this.brand = brand;
    }
    public void powerOn(){
        System.out.println(brand +"投影仪开机，正在预热...");

    }

    public void powerOff(){
        System.out.println(brand +"投影仪关机，散热中...");
    }
    public void repair() {

    }
}
